All customers who received error 11 today, please accept my deep appologies.
I'm investigating what happened and will report shortly to each of you who submitted RIP reports to support.

UPD:
At this moment it's clear that the problem happens in 12020 x64 version only (both PRO and Personal)
Fix will be available shortly, meanwhile I rolled back 12020 and you can switch to 12019 -- it's what is available on My Products page now

UPD2:
12021 is available online